litex-boards/litex_boards/targets/terasic_sockit.py

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#!/usr/bin/env python3
#
# This file is part of LiteX-Boards.
#
# Copyright (c) 2020 Hans Baier <hansfbaier@gmail.com>
# SPDX-License-Identifier: BSD-2-Clause
from migen import *
from litex.gen import *
from litex_boards.platforms import terasic_sockit
from litex.soc.cores.clock import CycloneVPLL
from litex.soc.integration.soc_core import *
from litex.soc.integration.builder import *
from litex.soc.cores.led import LedChaser
from litex.soc.cores.video import VideoVGAPHY
from litex.build.io import DDROutput
from litedram.modules import W9825G6KH6, AS4C32M16
from litedram.phy import HalfRateGENSDRPHY, GENSDRPHY
# CRG ----------------------------------------------------------------------------------------------
class _CRG(LiteXModule):
def __init__(self, platform, sys_clk_freq, with_sdram=False, sdram_rate="1:2", with_video_terminal=False):
self.sdram_rate = sdram_rate
self.rst = Signal()
self.cd_sys = ClockDomain()
if with_video_terminal:
self.cd_vga = ClockDomain()
if with_sdram:
if sdram_rate == "1:2":
self.cd_sys2x = ClockDomain()
self.cd_sys2x_ps = ClockDomain()
else:
self.cd_sys_ps = ClockDomain()
# Clk / Rst
clk50 = platform.request("clk50")
# PLL
self.pll = pll = CycloneVPLL(speedgrade="-C6")
self.comb += pll.reset.eq(self.rst)
pll.register_clkin(clk50, 50e6)
pll.create_clkout(self.cd_sys, sys_clk_freq)
if with_video_terminal:
pll.create_clkout(self.cd_vga, 65e6)
if with_sdram:
if sdram_rate == "1:2":
pll.create_clkout(self.cd_sys2x, 2*sys_clk_freq)
pll.create_clkout(self.cd_sys2x_ps, 2*sys_clk_freq, phase=180) # Idealy 90° but needs to be increased.
else:
pll.create_clkout(self.cd_sys_ps, sys_clk_freq, phase=90)
# SDRAM clock
if with_sdram:
sdram_clk = ClockSignal("sys2x_ps" if sdram_rate == "1:2" else "sys_ps")
self.specials += DDROutput(1, 0, platform.request("sdram_clock"), sdram_clk)
# BaseSoC ------------------------------------------------------------------------------------------
class BaseSoC(SoCCore):
def __init__(self, sys_clk_freq=50e6, revision="revd", sdram_rate="1:2", mister_sdram=None,
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with_led_chaser = True,
with_video_terminal = False,
**kwargs):
platform = terasic_sockit.Platform(revision)
# CRG --------------------------------------------------------------------------------------
self.crg = _CRG(platform, sys_clk_freq,
with_sdram = mister_sdram != None,
sdram_rate = sdram_rate,
with_video_terminal = with_video_terminal
)
# SoCCore ----------------------------------------------------------------------------------
if kwargs.get("uart_name", "serial") == "serial":
kwargs["uart_name"] = "jtag_uart" # Defaults to JTAG-UART.
SoCCore.__init__(self, platform, sys_clk_freq, ident="LiteX SoC on the Terasic SoCKit", **kwargs)
# SDR SDRAM --------------------------------------------------------------------------------
if mister_sdram is not None:
sdrphy_cls = HalfRateGENSDRPHY if sdram_rate == "1:2" else GENSDRPHY
sdrphy_mod = {"xs_v22": W9825G6KH6, "xs_v24": AS4C32M16}[mister_sdram]
self.sdrphy = sdrphy_cls(platform.request("sdram"), sys_clk_freq)
self.add_sdram("sdram",
phy = self.sdrphy,
module = sdrphy_mod(sys_clk_freq, sdram_rate),
l2_cache_size = kwargs.get("l2_size", 8192)
)
# Video Terminal ---------------------------------------------------------------------------
if with_video_terminal:
vga_pads = platform.request("vga")
self.comb += [ vga_pads.sync_n.eq(0), vga_pads.blank_n.eq(1) ]
self.specials += DDROutput(i1=1, i2=0, o=vga_pads.clk, clk=ClockSignal("vga"))
self.videophy = VideoVGAPHY(vga_pads, clock_domain="vga")
self.add_video_terminal(phy=self.videophy, timings="1024x768@60Hz", clock_domain="vga")
# Leds -------------------------------------------------------------------------------------
if with_led_chaser:
self.leds = LedChaser(
pads = platform.request_all("user_led"),
sys_clk_freq = sys_clk_freq)
# Build --------------------------------------------------------------------------------------------
def main():
from litex.build.parser import LiteXArgumentParser
parser = LiteXArgumentParser(platform=terasic_sockit.Platform, description="LiteX SoC on the Terasic SoCKit.")
parser.add_target_argument("--single-rate-sdram", action="store_true", help="Clock SDRAM with 1x the sytem clock (instead of 2x).")
parser.add_target_argument("--mister-sdram-xs-v22", action="store_true", help="Use optional MiSTer SDRAM module XS v2.2 on J2 on GPIO daughter card.")
parser.add_target_argument("--mister-sdram-xs-v24", action="store_true", help="Use optional MiSTer SDRAM module XS v2.4 on J2 on GPIO daughter card.")
parser.add_target_argument("--revision", default="revd", help="Board revision (revb, revc or revd).")
parser.add_target_argument("--sys-clk-freq", default=50e6, type=float, help="System clock frequency.")
parser.add_target_argument("--with-video-terminal", action="store_true", help="Enable Video Terminal (VGA).")
args = parser.parse_args()
soc = BaseSoC(
sys_clk_freq = args.sys_clk_freq,
revision = args.revision,
sdram_rate = "1:1" if args.single_rate_sdram else "1:2",
mister_sdram = "xs_v22" if args.mister_sdram_xs_v22 else "xs_v24" if args.mister_sdram_xs_v24 else None,
with_video_terminal = args.with_video_terminal,
**parser.soc_argdict
)
builder = Builder(soc, **parser.builder_argdict)
if args.build:
builder.build(**parser.toolchain_argdict)
if args.load:
prog = soc.platform.create_programmer()
prog.load_bitstream(builder.get_bitstream_filename(mode="sram"))
if __name__ == "__main__":
main()